Maharashtra Board Class 8 Geography Solution Chapter 1 – Local Time and Standard Time
Balbharati Maharashtra Board Class 8 Geography Solution Chapter 1: Local Time and Standard Time. Marathi or English Medium Students of Class 8 get here Local Time and Standard Time full Exercise Solution.
Std | Maharashtra Class 8 |
Subject | Geography Solution |
Chapter | Local Time and Standard Time |
Exercise Solution
Q-1. Complete the sentence by selecting the correct option:
(a) The earth requires 24 hours for one rotation. In one hour,
(i) 5 longitudes will face the sun
(ii) 10 longitudes will face the sun
(iii) 15 longitudes will face the sun
(iv) 20 longitudes will face the sun
Ans. (iii) As the earth rotates in 360 degrees it will take about 15 longitudes to rotate around the sun.
Therefore, 360 degree / 24 = 15.
(b) To calculate the difference between the local times of any two places on the earth
(i) the noon time at both the places should be known
(ii) the difference in degrees of their longitudes should be known
(iii) the difference in standard times of both the places should be known
(iv) Changes need to be made according to International Date Line
Ans. (ii) the difference in degrees of their longitudes should be known
Hence, if we know how many longitudes lie in between two places. We can add 4 that may times and find out the differences between the local times of those two places under consideration.
(c) The difference between the local time of any two consecutive longitudes is-
(i) 15 minutes
(ii) 04 minutes
(iii) 30 minutes
(iv) 60 minutes
Ans. (ii) 04 minutes
The sun is positioned at 360 degrees at 24 hours.
Therefore 3600/24 = 15 degrees at 1 hour / 60 minutes.
Therefore 1 degree = 60/15 = 4 minutes.
Q 2. Give geographical reasons:
(a) The local time is decided by the noon time.
Ans. The local time of a place is decided with the help of noon time. It is because the noon times is the same at any given longitude across the earth i.e. from the North Pole to the South Pole.
(b) The local time at Greenwich is considered to be the international standard time.
Ans. The international standard time has been decided according to 0 degree longitude passes through Greenwich. For an international co-ordination, it is essential to bring compatibility between the standard time of various countries in the world. For the purpose, the local time at Greenwich is considered to be the International standard time.
(c) The standard time of India has been decided by the local time at 82.5° E longitude
(d) Canada has 6 different standard times.
Solution:
- Central Standard Time (GMT – 6)
- Mountain Daylight Time (GMT – 6)
- Pacific Daylight Time (GMT – 7)
Q 3. Answer in brief:
(a) If it is 12 noon at 60°E longitude, then explain what would be the time at 30° W longitude?
Answer: As we move towards the east of the Prime Meridian, the local time increases by 4 minutes for every longitude.
The difference between the longitudes of 60 degree East and 30 degree West = (60 degree + 30 degree) = 90 degree.
Difference in local time = 90 x 4 = 360 minutes.
= 360 ÷ 60 minutes
= 6 hours.
We know that 1 hour = 60 minutes, then the time 30 degrees west will be (12 noon – 6 hours) because it behind the prime meridian, which gives 6 am. Thus time 30 degree W is 6 am.
(b) How is the standard time of a place determined?
Answer: Standard time is the official local time of a particular region. It is determined by the distance of meridian of a place from the prime meridian. It is considered as the fixed time for the places at same meridian.
It is same for the entire country. However places on the same longitude have different standard time.
(c) A football match being played at Sao Paulo, Brazil started in India at 6 am IST. Explain what would be the local time at Sao Paulo?
Answer: Sao Paulo is located in the South Western hemisphere of the Earth. India is located North-Easter hemisphere of the earth.
Sao Paulo is located at a time of GMT- 3 hours while India is located at a time of GMT + 5 hours.
India is approximately 8 hours 30 min ahead of Sao Paulo.
So for finding out the time of Sao Paulo we have to go back 8 hour 30 min. 6 am in India = 9:30 pm in Brazil.
So, the match will start at 9:30 pm in Sao Paulo.
Q 4. If it is 10 pm on 21st June at Prime Meridian, write the dates and time at A, B and C in the table.
Place | Longitude | Date | Time |
A | 1200 E | ||
B | 1600 W | ||
C | 600 E |
Solution:
Q 5. Write the situations of place A shown in these diagrams in the boxes below them :
(i) Sunrise (ii) midnight (iii) noon (iv) Sunset
(i) Mid Night
Point A lies in the shadow region. It is located diametrically opposite to the position of noon.
Hence, Midnight.
(ii) Sunset.
Point A is about to enter into the shadow region as indirected from the direction of rotation. Hence, Sunset.
(iii) Sunrise
Point A is about to enter into the sunlight region, as indicated from the direction of rotation. Hence, Sunrise.
(iv) Noon
Point A lies in the sunlight region Also the sun is exactly over the head of point A. Hence, Noon.
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